Anatomical Variations of the Circulus Arteriosus in Cadaveric Human Brains

Table 8

Comparison of morphological variations of PoCoA.

Variation type; PoCoA	Present study	Kapoor et al. [17]	Alpers et al. [12]	Al-Hussain et al. [29]	Merkkola et al. [32]
Absent	4	1	—	13	46%
Hypoplasia	27.33	—	—	—	—
Fenestration	0.66	—	—	33	—
PCA formation	18	—	14.6	77	—
Symmetrical	62	—	—	—	—
Asymmetrical	38	—	—	29	—